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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05e263f40be75b0f5a39486249ddaeb81956d056ddd358ed74604db68ec034f' 
  AND token = 'rP4YUjmbSw9t1898V8E4U5yl9ML/7t4K1ipvPZza12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}